Use hot glue to glue the ribbon in a graceful swag design. You only have to glue it in spots.
Glue the flowers on using the smallest to cover the base of the larger ones.
It doesn't take many flowers.
Spray with flat white spray paint. This stiffens them. Remove any strings of glue that show up. You want them stiff because next......
You're going to paint them with flat latex wall paint. Really glop it on heavy. A small soft brush is best for this. You want the effect of gesso. You may want to give it a second coat because you want it on thick.
I used craft paint to paint the flowers and ribbon but I thought it turned out too bright.
So I sprayed it lightly again with the flat white spray paint.
This took less than an hour, not counting the time waiting for the latex to dry.
*footnote - the Easter grass? It's a cheerleader's pom pom I picked up at the thrift store for 39 cents. Turned upside down it looks like regular Easter grass but it's all fastened together so no picking up strands all over the house!